In the beginning, people came from England to America and landed in the East.

Then later some people moved west. There was a saying "Go west, young man".

There are big cities in the East and more people vote for the Democratic Party (Obama). Americans say "blue states" for Democratic states.

There is more open space in the West and more people vote for the Republican Party (Bush). Americans say "red states" for Republican states.

Sometimes Westerners and Easterners will argue, and Westerners will say to Easterners "Go back east".